CN105004095A - Compound heat pump system for co-production by adopting trans-critical circle and two-stage absorption type heat pump cycle - Google Patents

Compound heat pump system for co-production by adopting trans-critical circle and two-stage absorption type heat pump cycle Download PDF

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CN105004095A
CN105004095A CN201510395706.7A CN201510395706A CN105004095A CN 105004095 A CN105004095 A CN 105004095A CN 201510395706 A CN201510395706 A CN 201510395706A CN 105004095 A CN105004095 A CN 105004095A
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heat
heat pump
trans
pump
solution
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CN105004095B (en
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何一坚
王祎
李�荣
蒋云云
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/02—Compression-sorption machines, plants, or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Sorption Type Refrigeration Machines (AREA)

Abstract

The invention discloses a compound heat pump system for co-production by adopting trans-critical circle and two-stage absorption type heat pump cycle. The compound heat pump system comprises a trans-critical compression subsystem and a heat pump subsystem which takes the trans-critical compression subsystem as a heat source, wherein the heat pump subsystem comprises first absorption type heat pump subsystems and second absorption type heat pump subsystems which are in energy coupling with the trans-critical compression subsystem. The invention further discloses a co-production method by adopting trans-critical circle and two-stage absorption type heat pump cycle. According to the compound heat pump system, by virtue of reasonable energy coupling of trans-critical cycle and two-stage absorption type cycle, heat energy output of conventional compression cycle is changed; by sufficiently utilizing condensation heat of the trans-critical circle and an extremely low-grade heat source, and the two-stage absorption type heat pump outputs an available conventional heat source, so that the integral performance of the heat pump system is improved; and according to analysis, in comparison with conventional trans-critical heat pump cycle, the heat pump system can increase a heating performance coefficient by more than 40%, has good economical efficiency, and is simple in integral structure.

Description

The combined heat-pump system of a kind of trans critical cycle and the coproduction of two-stage absorption heat pump
Technical field
The present invention relates to technical field of heat pumps, the combined heat-pump system of particularly a kind of trans critical cycle and the coproduction of two-stage absorption heat pump.
Background technology
Trans critical cycle uses working medium environmental protection (multiplex natural refrigerant CO because of it 2) be applied to heat pump air conditioner field and obtain paying close attention to more and more widely; And its delivery temperature is high, can reach 110 DEG C when outlet pressure is 10MPa, temperature glide is large, has a large amount of waste heat of condensation and can supply to recycle, as far back as 1999, and the CO of M.Saikawa and K.Hashimoto research and development 2teat pump boiler just can provide the hot water of 90 DEG C; Meanwhile, Trans-critical cycle heat pump cycle has the very high coefficient of performance, CO 2the COP of Teat pump boiler can reach more than 4.5.
Such as notification number CN 102003833 B patent document discloses a kind of CO 2 trans-critical heat pump type air conditioner and water heater utilizing waste heat of condensation.It comprises compressor, chilled water double pipe heat exchanger, reservoir, choke valve, indoor finned tube exchanger, bushing type regenerator, gas-liquid separator and attemperater; The working medium entrance of the cavity between the inner and outer pipes of described chilled water double pipe heat exchanger connects the high-pressure mouth of compressor, sender property outlet discharge the cavity of carbon dioxide successively between regenerator inner and outer pipes, reservoir, choke valve, indoor finned tube exchanger, pipe, gas-liquid separator enter compressor low pressure port in regenerator, the two ends of the interior pipe of chilled water double pipe heat exchanger are all connected with attemperater by water pipe, and water pipe is provided with tubing pump.The present invention adopts chilled water double pipe heat exchanger to reclaim the condensation waste heat of heat pump type air conditioning system, and utilizes the heat reclaimed to prepare domestic hot-water, not only increases energy utilization rate, and alleviates the thermal pollution of air-conditioning to environment.
In order to enter the utilization rate that does not improve trans critical cycle used heat, adopt compression circulation and Absorption heat-transformer compound effectively can improve entire system COP, absorption heat pump cycle is divided into two classes, first-class absorption type heat pump utilizes a small amount of high temperature heat source to produce a large amount of useful heat energy of middle temperature, the coefficient of performance is generally 1.5 ~ 2.5, but available high temperature heat source grade is higher, there is heat up to more than 80 DEG C in single-stage circulation; Second-kind absorption-type heat pump utilizes a large amount of middle temperature-heat-source to produce the useful heat energy of a small amount of high temperature, the coefficient of performance is generally 0.4 ~ 0.5, but available thermal source grade is lower, single-stage circulation generation heat can to less than 50 DEG C, and the low-grade heat source making some useless is utilized effectively.
Such as application number is that the Chinese patent literature of 201210147756.X discloses the Trans-critical cycle/absorption combined refrigerator utilizing low-grade heat, this is the Trans-critical cycle compression absorption hybrid system of an enclosed, system high pressure level utilizes the high temperature condensation heat of trans critical cycle fully, low-pressure stage then effectively utilizes useless low grade heat energy, can significantly improve Trans-critical cycle refrigerating efficiency, but be only limitted to refrigerating function.
Again such as application number be 200910098013.6 Chinese patent literature disclose low-grade energy drive with mechanical power driven composite heat pump or refrigeration system, then make use of the high-grade heat in compression cycle exhaust, there is low-grade energy heat pump, refrigeration system, when the supply of product potential energy is abundant, system COP significantly improves, but utilize heat quality higher, have some limitations.
Summary of the invention
The invention provides the combined heat-pump system of a kind of trans critical cycle and the coproduction of two-stage absorption heat pump, to be circulated rational Energy Coupling by trans critical cycle and two-stage absorption, take full advantage of the condensation heat of trans critical cycle, improve heat pump overall performance.
The combined heat-pump system of a kind of trans critical cycle and the coproduction of two-stage absorption heat pump, comprise Trans-critical cycle compression subsystem and using the heat pump subsystem of Trans-critical cycle compression subsystem as thermal source, described Trans-critical cycle compression subsystem comprises: the compression unit connected by working medium circulation, air cooling unit, throttling unit and evaporation element, described air cooling unit is divided into the first heating tube of exothermic condensation step by step, the second heating tube and air cooler along the flow direction of working medium, and described heat pump subsystem comprises first-class absorption type heat pump subsystem and second-kind absorption-type heat pump subsystem;
Described first-class absorption type heat pump subsystem comprises:
First generator, is equipped with the first working fluid, and described first heating tube is arranged in the first generator for heating the first working fluid;
Condenser, import is connected with the steam (vapor) outlet of the first generator, is provided with and the vapor heated first heat output block from the first generator;
First throttle device, import is connected with the outlet of condenser;
First condenser/evaporator, comprise first passage and the second channel of heat exchange, the import of described first passage is connected with the outlet of first throttle device, the outlet of described first passage is connected with the steam inlet of the first absorber, and described second channel passes into the steam from second-kind absorption-type heat pump subsystem;
First absorber, is equipped with the first working fluid;
First solution pump, import is connected with the taphole of the first absorber;
First solution heat exchanger, comprise third channel and the four-way of heat exchange, the entrance of described third channel is connected with the first solution delivery side of pump, the outlet of described third channel is connected with the solution inlet of the first generator, the entrance of described four-way is connected with the taphole of the first generator, and the outlet of described four-way is connected with the solution inlet of the first absorber;
Second throttling arrangement, import is connected with the outlet of described four-way, and outlet is connected with the entrance of the first absorber solution;
Described second-kind absorption-type heat pump subsystem comprises:
Second generator, is equipped with the second working fluid, and be inside provided with the 3rd heating tube for heating the second working fluid, steam (vapor) outlet is connected with the import of the second channel of the first condenser/evaporator;
Second solution pump, import is connected with the outlet of the second channel of the first condenser/evaporator;
Second condenser/evaporator, comprise the Five-channel with described second heating tube heat exchange, the import of described Five-channel is connected with the second solution delivery side of pump;
Second absorber, be inside provided with the second heat output block with the second working fluid heat exchange, steam inlet is connected with the outlet of Five-channel;
Second solution heat exchanger, comprise Hexamermis spp and the 7th passage of heat exchange, the entrance of described Hexamermis spp is connected with the taphole of the second absorber;
3rd throttling arrangement, import is connected with the outlet of described Hexamermis spp, and outlet is connected with the solution inlet of the second generator;
3rd solution pump, import is connected with the taphole of the second generator, and outlet is connected with the entrance of the 7th passage of the second solution heat exchanger, and the outlet of the 7th passage is connected with the solution inlet of the second absorber.
In order to raise the efficiency, described Trans-critical cycle compression subsystem also comprises backheat unit, carries out heat exchange by from the cold-producing medium of air cooler and the cold-producing medium of compressed cell compression; Each throttling arrangement can adopt choke valve; Described first heating tube and the second heating tube generally adopt coil arrangement.
The superheated refrigerant steam that the present invention is formed after utilizing the compression unit acting of Trans-critical cycle compression subsystem, superheated refrigerant steam is first by the middle exothermic condensation cooling in the first generator of first-class absorption type heat pump subsystem of the first heating tube, then by the further heat release cooling in the second condenser/evaporator of second-kind absorption-type heat pump subsystem of the second heating tube, finally lower the temperature further through air cooler again, described first heating tube had both heated solution in the first generator of first-class absorption type heat pump subsystem and had produced refrigerant vapour, the high-temperature exhaust air of cooled compressed unit again, the second heating tube in described second condenser/evaporator is both as the evaporimeter of second-kind absorption-type heat pump subsystem, the high-temperature exhaust air of further cooled compressed unit again, described first heating tube, the second heating tube and air cooler are jointly as the air cooling unit of Trans-critical cycle compression subsystem.
The course of work of the combined heat-pump system of above-mentioned trans critical cycle and the coproduction of two-stage absorption heat pump is as follows:
(1) described Trans-critical cycle compression subsystem periodic duty, described first heating tube, the second heating tube and air cooler heat;
(2) in described first-class absorption type heat pump subsystem, first heating tube heats the first working fluid in the first generator, produce the cold-producing medium water vapour of HTHP, the cold-producing medium water vapour of HTHP enters condenser and lowers the temperature into high-pressure liquid water through heat exchange, and described condenser exports as thermal source;
Described high-pressure liquid water becomes low-temp low-pressure aqueous water through the step-down of first throttle device, passes into the first condenser/evaporator, and evaporating with the steam heat-exchanging from second-kind absorption-type heat pump subsystem becomes low-temperature low-pressure refrigerant water vapour, is finally absorbed by the first absorber;
In first generator, the first working fluid of HTHP, through entering the first absorber from cooling step-down through the second throttling arrangement after the first working fluid heat exchange of the first absorber low-temp low-pressure in the four-way and third channel of the first solution heat exchanger, gets back to the first generator by the first solution pump after the first working fluid heat exchange in third channel simultaneously;
(3) in described second-kind absorption-type heat pump subsystem, described 3rd heating tube heats the second working fluid in the second generator, produce the cold-producing medium water vapour of low-temp low-pressure, the cold-producing medium water vapour of low-temp low-pressure enters the first condenser/evaporator and is lowered the temperature by the low-temperature refrigerant water cooling from first-class absorption type heat pump subsystem, becomes cryogenic high pressure aqueous water by the second solution pump supercharging;
Cryogenic high pressure aqueous water becomes cold-producing medium steam and enters the second absorber and absorbed be subject to the heating of the second heating tube in the second condenser/evaporator after;
In second generator, the second working fluid of low-temp low-pressure enters the second absorber by the 3rd solution pump supercharging after the second working fluid heat exchange from the HTHP of the second absorber in the 7th passage and Hexamermis spp of the second solution heat exchanger simultaneously, the second working fluid in Hexamermis spp gets back to the second generator after the 3rd throttling arrangement cooling step-down, and the second working fluid in described second absorber exports as thermal source.
Apparatus of the present invention can take full advantage of the condensation heat of trans critical cycle, improve heat pump overall performance of the present invention.
In order to reduce energy consumption, preferably, described 3rd heating tube connects low-grade heat source.Utilize the circulation of Trans-critical cycle compression subsystem and low-grade heat source to provide to two-stage absorption heat pump and heat occurs, make full use of the energy of useless low-grade heat source, simultaneously carry out heat output at the condenser of two-stage absorption heat pump and the second absorber, heat energy is fully utilized, energy utilization rate is high, has good economic benefit.
Low-grade heat source refers to for the high-grade thermal source that produces relative to the burning such as natural gas, oil, is that to comprise energy in same units lower, the discharge heat that generally cannot directly utilize; Heat source temperature is lower, utilizes difficulty larger, wherein will be called low-grade heat source lower than the thermal source of about 50 DEG C.
Preferably, the occurrence temperature that described low-grade heat source provides is 32 ~ 45 DEG C, is expected to the comparatively low-temperature level part utilizing Trans-critical cycle heat extraction further, can reduce the low-grade heat source of extraneous input.
Preferred further, the occurrence temperature that described low-grade heat source provides is 35 ~ 40 DEG C, can utilize the comparatively low-temperature level part of Trans-critical cycle heat extraction further, and minimizing even inputs without the need to external heat source and generator venting scope is reasonable, improves the efficiency of heat pump.
Preferably, described low-grade heat source is described air cooler.Utilize Trans-critical cycle heat extraction to two-stage absorption heat pump heat supply completely, the occurrence temperature provided is 32 ~ 35 DEG C.
Preferably, the cooling medium of described air cooler and condenser adopts water or air.Water and air is easy to obtain, and has good cooling effect, and can also drop into life use after heating.
The first kind and second-kind absorption-type heat pump subsystem working fluid used are the combination of cold-producing medium and absorbent, and preferably, described first working fluid is lithium bromide water solution or ammoniacal liquor.
Preferably, described second working fluid is lithium bromide water solution or ammoniacal liquor.
When working fluid is lithium bromide water solution, wherein lithium bromide is as absorbent, and water is as cold-producing medium.
When working fluid is ammoniacal liquor, wherein water is as absorbent, and ammonia is as cold-producing medium.
At present, the ozone layer in atmosphere is seriously damaged, and greenhouse effects are day by day serious, and the trans critical cycle therefore in the present invention adopts natural refrigerant carbon dioxide or nitrous oxide.
CO 2, as a kind of safe and reliable natural medium, oneself caused extensive concern in recent years, and the application in trans critical cycle also develops rapidly; N 2o as another kind of natural medium, its physical property and CO 2similar, the molecular weight of the two, critical-temperature, critical pressure are close, N 2the triple point of O is-90.82 DEG C, far below CO 2-55.58 DEG C, more low temperature field can be applied to.Preferably, the working medium of described Trans-critical cycle compression subsystem is carbon dioxide or nitrous oxide.
Beneficial effect of the present invention:
The combined heat-pump system of trans critical cycle of the present invention and the coproduction of two-stage absorption heat pump is a kind of novel compression/two-stage sorption type heat pump hybrid system, to be circulated rational Energy Coupling by trans critical cycle and two-stage absorption, the heat energy changing conventional compression cycle exports, make full use of the condensation heat of trans critical cycle, extremely low-grade thermal source can also be utilized simultaneously, two-stage absorption heat pump exports available conventional heat sources, improve the overall performance of heat pump, by analysis, compared to traditional Trans-critical cycle heat pump cycle, heat pump of the present invention can improve coefficient of performance in heating more than 40%, economy is good and overall structure is simple.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1 is compressor, 2 is the first heat(ing) coil, 3 is the second condenser/evaporator, 4 is air cooler, 5 is regenerator, 6 is the 4th choke valve, 7 is evaporimeter, 8 is the second absorber, 9 is the second solution heat exchanger, 10 is the 3rd choke valve, 11 is the second generator, 12 is the 3rd solution pump, 13 is the first condenser/evaporator, 14 is the second solution pump, 15 is the first absorber, 16 is the first solution pump, 17 is the first solution heat exchanger, 18 is the first generator, 19 is second throttle, 20 is condenser, 21 is first throttle valve, 22 is the second heat(ing) coil.
Detailed description of the invention
As shown in Figure 1, the trans critical cycle of the present embodiment and the combined heat-pump system of two-stage absorption heat pump coproduction comprise: Trans-critical cycle compression subsystem, first-class absorption type heat pump subsystem and second-kind absorption-type heat pump subsystem;
Wherein first-class absorption type heat pump subsystem comprises:
First generator 18, condenser 20, first throttle valve 21, first condenser/evaporator 13, first absorber 15, first solution pump 16, first solution heat exchanger 17 and second throttle 19; The steam (vapor) outlet of the first generator 18 is connected with condenser 20 import, condenser 20 exports and is connected with first throttle valve 21 import, first throttle valve 21 exports and is connected with the first condenser/evaporator 13 first passage import, and the first condenser/evaporator 13 first passage outlet is connected with the first absorber 15 steam inlet; First absorber 15 taphole first solution pump 16 import is connected, and the first solution pump 16 exports and is connected with the first solution heat exchanger 17 third channel entrance, and the first solution heat exchanger 17 third channel outlet is connected with the first generator 18 solution inlet; First generator 18 taphole is connected with the first solution heat exchanger 17 four-way entrance, and the first solution heat exchanger 17 four-way outlet is connected with second throttle 19 import, and second throttle 19 exports and is connected with absorber solution inlet.
Wherein second-kind absorption-type heat pump subsystem comprises:
Second generator 11, second solution pump 14, second condenser/evaporator 3, second absorber 8, second solution heat exchanger 9, the 3rd choke valve 10 and the 3rd solution pump 12; Second generator 11 steam (vapor) outlet is connected with the first condenser/evaporator 13 second channel import, first condenser/evaporator 13 second channel outlet is connected with the second solution pump 14 import, second solution pump 14 exports and is connected with the second condenser/evaporator 3 Five-channel import, and the second condenser/evaporator 3 Five-channel outlet is connected with the second absorber 8 steam inlet; Second absorber 8 taphole is connected with the second solution heat exchanger 9 Hexamermis spp entrance, and the second solution heat exchanger 9 Hexamermis spp outlet is connected with the 3rd choke valve 10 import, and the 3rd choke valve 10 exports and is connected with the second generator 11 solution inlet; Second generator 11 taphole is connected with the 3rd solution pump 12 import, and the 3rd solution pump 12 exports and is connected with the second solution heat exchanger 9 the 7th feeder connection, and the second solution heat exchanger 9 the 7th channel outlet is connected with the second absorber 8 solution inlet.
Wherein Trans-critical cycle compression subsystem comprises:
Compressor 1, accesses the first heat(ing) coil 2 of the first generator 18 heat supply, is arranged in the second condenser/evaporator 3 the second heat(ing) coil 22 carrying out heat exchange, air cooler 4, regenerator 5, the 4th choke valve 6 and evaporimeter 7; Compressor 1 steam (vapor) outlet is connected with the first heat(ing) coil 2 import, first heat(ing) coil 2 exports and is connected with the second heat(ing) coil 22 entrance of the second condenser/evaporator 3, the outlet of the second heat(ing) coil 22 is connected with air cooler 4 entrance, air cooler 4 exports and is connected with regenerator 5 first passage entrance, the outlet of regenerator 5 first passage is connected with the 4th choke valve 6 import, 4th choke valve 6 exports and is connected with evaporimeter 7 import, evaporimeter 7 exports and is connected with regenerator 5 second channel entrance, and the outlet of regenerator 5 second channel is connected with compressor 1 import.
The working fluid of the first kind/second-kind absorption-type heat pump subsystem adopts lithium bromide water solution, and the working medium of Trans-critical cycle compression subsystem adopts carbon dioxide.
The combined heat-pump system workflow that the present embodiment carries out the critical cycle of coproduction and the coproduction of two-stage absorption heat pump is as follows:
(1) in Trans-critical cycle compression subsystem, carbon dioxide forms overheated carbon dioxide coolant steam after compressor 1 does work, first exothermic condensation cooling in the first heat(ing) coil 2 of the first generator 18 inside setting, then lower the temperature further in the second heat(ing) coil 22 of the second condenser/evaporator 13, cool further through air cooler 4 again and become carbon dioxide liquid, then by the carbon dioxide coolant steam heat-shift in regenerator 5 first passage and second channel, then heat absorption evaporation in evaporimeter 7 is entered through the 4th choke valve 6, heating source is outside air or water, carbon dioxide coolant steam after evaporation is after regenerator 5 second channel heat-shift, get back to compressor 1, start new circulation.
(2) in first-class absorption type heat pump subsystem, in the first generator 18, lithium bromide water solution heats the cold-producing medium water vapour producing HTHP through the first heat(ing) coil 2, enter condenser 20 cooling and become high-pressure liquid water, condenser 20 can outside quantity of heat given up as thermal source, becomes low-temp low-pressure aqueous water by first throttle valve 21 step-down;
Low-temp low-pressure aqueous water becomes low-temperature low-pressure refrigerant steam in the first condenser/evaporator 13 first passage with from the steam heating evaporation of the second-kind absorption-type heat pump subsystem in second channel, after enter the first absorber 15 and absorbed.
In first generator 18, the lithium bromide water concentrated solution of HTHP is through entering the first absorber 15 from cooling step-down through second throttle 19 after rare lithium bromide water solution heat exchange of the first absorber low-temp low-pressure in the first solution heat exchanger 17 four-way and third channel simultaneously, and the rare lithium bromide water solution in first passage then gets back to the first generator 18.
(3) in second-kind absorption-type heat pump subsystem, in the second generator 11, lithium bromide water solution produces the cold-producing medium water vapour of low-temp low-pressure through extremely low-grade heat source, enter the first condenser/evaporator 13 second channel to be lowered the temperature by the low-temperature refrigerant water cooling from the first-class absorption type heat pump subsystem in first passage, become cryogenic high pressure aqueous water by the second solution pump 14 supercharging.
Cryogenic high pressure aqueous water becomes higher temperature and pressure cold-producing medium steam be subject to from Trans-critical cycle compression subsystem compressor 1 high temperature carbon dioxide gas heating by the second heat(ing) coil 22 in the second condenser/evaporator 3 after enters the second absorber 8 and is absorbed;
Simultaneously in the second generator 11 low-temp low-pressure lithium bromide water concentrated solution through the 3rd solution pump 12 supercharging through in the second solution heat exchanger 9 the 7th passage and Hexamermis spp from rare lithium bromide water solution heat exchange of the second absorber 8 HTHP after enter the second absorber 8, weak solution in Hexamermis spp gets back to the second generator 11 after the 3rd choke valve 10 cools step-down, and the lithium bromide water solution at the second absorber 11 place can outside quantity of heat given up as thermal source.
The present embodiment can make full use of the condensation heat of trans critical cycle, extremely low-grade thermal source can also be made full use of simultaneously, two-stage absorption heat pump exports available conventional heat sources, improve the overall performance of heat pump, in order to further illustrate the advantage of trans critical cycle of the present invention and two-stage absorption heat pump cycle co-generation system, test in following operating mode:
Compressor 1 pressure at expulsion of Trans-critical cycle compression subsystem is 10MPa, and the heat medium of evaporimeter 7 adopts outside air or water, and evaporating temperature is 20 DEG C, when needing preparation temperature to be the heat output of 50 DEG C:
If adopt common CO 2trans-critical cycle heat pump coefficient of performance in heating is 3.26;
And adopt the heat pump co-generation system of the present embodiment, wherein the first heat(ing) coil 2 of Trans-critical cycle compression subsystem is supplied to the temperature of first-class absorption type heat pump generation heat is 80 DEG C, absorb temperature 30 DEG C (adopting outside air or water cooling), the condensation temperature 50 DEG C of condenser 20 exports as thermal source; First condenser/evaporator 13 is also provided with cooling duct, chilling temperature is 20 DEG C (adopting outside air or water cooling), disabled extremely low-grade heat source taked by second-kind absorption-type heat pump generator, occurrence temperature 40 DEG C, in second absorber 8, solution temperature 50 DEG C exports as another thermal source, second condenser/evaporator 3 temperature is 40 DEG C, then under this operating mode, reach 4.59 according to the coefficient of performance in heating of rational Energy Coupling gained, compared to prior art performance boost 40.8%, the heat pump co-generation system of visible the present embodiment has good economy.

Claims (9)

1. the combined heat-pump system of a trans critical cycle and the coproduction of two-stage absorption heat pump, comprise Trans-critical cycle compression subsystem and using the heat pump subsystem of Trans-critical cycle compression subsystem as thermal source, described Trans-critical cycle compression subsystem comprises: the compression unit connected by working medium circulation, air cooling unit, throttling unit and evaporation element, it is characterized in that, described air cooling unit is divided into the first heating tube of exothermic condensation step by step along the flow direction of working medium, second heating tube and air cooler, described heat pump subsystem comprises first-class absorption type heat pump subsystem and second-kind absorption-type heat pump subsystem,
Described first-class absorption type heat pump subsystem comprises:
First generator, is equipped with the first working fluid, and described first heating tube is arranged in the first generator for heating the first working fluid;
Condenser, import is connected with the steam (vapor) outlet of the first generator, is provided with and the vapor heated first heat output block from the first generator;
First throttle device, import is connected with the outlet of condenser;
First condenser/evaporator, comprise first passage and the second channel of heat exchange, the import of described first passage is connected with the outlet of first throttle device, the outlet of described first passage is connected with the steam inlet of the first absorber, and described second channel passes into the steam from second-kind absorption-type heat pump subsystem;
First absorber, is equipped with the first working fluid;
First solution pump, import is connected with the taphole of the first absorber;
First solution heat exchanger, comprise third channel and the four-way of heat exchange, the entrance of described third channel is connected with the first solution delivery side of pump, the outlet of described third channel is connected with the solution inlet of the first generator, the entrance of described four-way is connected with the taphole of the first generator, and the outlet of described four-way is connected with the solution inlet of the first absorber;
Second throttling arrangement, import is connected with the outlet of described four-way, and outlet is connected with the entrance of the first absorber solution;
Described second-kind absorption-type heat pump subsystem comprises:
Second generator, is equipped with the second working fluid, and be inside provided with the 3rd heating tube for heating the second working fluid, steam (vapor) outlet is connected with the import of the second channel of the first condenser/evaporator;
Second solution pump, import is connected with the outlet of the second channel of the first condenser/evaporator;
Second condenser/evaporator, comprise the Five-channel with described second heating tube heat exchange, the import of described Five-channel is connected with the second solution delivery side of pump;
Second absorber, be inside provided with the second heat output block with the second working fluid heat exchange, steam inlet is connected with the outlet of Five-channel;
Second solution heat exchanger, comprise Hexamermis spp and the 7th passage of heat exchange, the entrance of described Hexamermis spp is connected with the taphole of the second absorber;
3rd throttling arrangement, import is connected with the outlet of described Hexamermis spp, and outlet is connected with the solution inlet of the second generator;
3rd solution pump, import is connected with the taphole of the second generator, and outlet is connected with the entrance of the 7th passage of the second solution heat exchanger, and the outlet of the 7th passage is connected with the solution inlet of the second absorber.
2. the combined heat-pump system of trans critical cycle as claimed in claim 1 and the coproduction of two-stage absorption heat pump, is characterized in that, described 3rd heating tube connects low-grade heat source.
3. the combined heat-pump system of trans critical cycle as claimed in claim 2 and the coproduction of two-stage absorption heat pump, it is characterized in that, the occurrence temperature that described low-grade heat source provides is 32 ~ 45 DEG C.
4. the combined heat-pump system of trans critical cycle as claimed in claim 3 and the coproduction of two-stage absorption heat pump, it is characterized in that, the occurrence temperature that described low-grade heat source provides is 35 ~ 40 DEG C.
5. the combined heat-pump system of the trans critical cycle as described in claim as arbitrary in Claims 1 to 4 and the coproduction of two-stage absorption heat pump, is characterized in that, the cooling medium of described air cooler and condenser adopts water or air.
6. the combined heat-pump system of the trans critical cycle as described in claim as arbitrary in Claims 1 to 4 and the coproduction of two-stage absorption heat pump, is characterized in that, described first working fluid is lithium bromide water solution or ammoniacal liquor.
7. the combined heat-pump system of the trans critical cycle as described in claim as arbitrary in Claims 1 to 4 and the coproduction of two-stage absorption heat pump, is characterized in that, described second working fluid is lithium bromide water solution or ammoniacal liquor.
8. the combined heat-pump system of the trans critical cycle as described in claim as arbitrary in Claims 1 to 4 and the coproduction of two-stage absorption heat pump, is characterized in that, the working medium of described Trans-critical cycle compression subsystem is carbon dioxide or nitrous oxide.
9. the combined heat-pump system of trans critical cycle and the coproduction of two-stage absorption heat pump as claimed in claim 2 or claim 3, it is characterized in that, described low-grade heat source is described air cooler.
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CN110455012A (en) * 2019-09-10 2019-11-15 华北电力大学 A kind of vapor compression types absorption heat pump

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